Crown Audio Microphone CM 150 User Manual

PROFESSIONAL OMNIDIRECTIONAL  
CONDENSER MICROPHONE  
CM-150  
he CM-150 is a ½-inch-diameter  
(12.7-mm), omnidirectional electret-  
T
condenser microphone. It is intended  
for professional recording, free-field mea-  
surement and sound-level measurement.  
Because of its pre-aged titanium diaphragm,  
the CM-150 is extremely stable over a wide  
range of environmental conditions.  
The CM-150 has a very flat, wide-range fre-  
quency response. The mic is supplied with a  
proof-of-performance sheet, which shows  
frequency response and sensitivity. This  
information can be used to calibrate the mi-  
crophone. The mic capsule grille fits into a  
Bruel & Kjaer 4220 pistonphone or similar  
microphone calibrator.  
Specifications  
Element: Electret condenser.  
Fig. 1  
Frequency Response  
Frequency response (typical): 20 Hz to 20 kHz  
1.5 dB (see Fig. 1).  
Polar pattern: Omnidirectional (see Fig. 2)  
Impedance: 150 ohms, 240 ohms actual, bal-  
anced. Recommended minimum load imped-  
ance 1000 ohms.  
Open circuit sensitivity (48 volt supply): 10.5  
mV/Pa* (–39.5 dB re 1 volt/Pa) nominal.  
When used for recording, the CM-150  
sounds natural and accurate. It preserves  
the delicate timbre of acoustic instruments,  
yet can reproduce all the power of a pipe  
organ. The off-axis response is also smooth,  
so any leakage picked up has little colora-  
tion.  
Power sensitivity: –39.5 dB re 1 mW/Pa.  
Equivalent noise level (self-noise): 19 dB SPL  
Frequency in Hz  
typical, A-weighted (0 dB = .0002 dyne/cm2).  
S/N ratio: 75 dB at 94 dB SPL.  
Maximum SPL for 3% THD: 127 dB with 48V  
phantom power.  
Output connector: 3-pin male XLR type.  
Power: 18-48 volt phantom power, positive volt-  
age on pins 2 and 3 with respect to pin 1.  
Self-noise is low, permitting clean record-  
ings — especially with close miking. The  
mic can handle very loud sounds (127 dB  
SPL) without distortion. It is protected  
against static and RFI. The output is bal-  
anced, low impedance, which allows long  
cable runs without hum pickup or high-fre-  
quency loss. Powering is by 18-48 volt  
phantom power.  
Fig. 2  
330˚  
0˚  
30˚  
FRONT  
-0  
300˚  
270˚  
60˚  
90˚  
-5  
Current drain: 2.7 mA.  
-10  
Polarity: Positive (inward) pressure on the dia-  
phragm produces positive voltage on pin 2 with  
respect to pin 3 of the output connector.  
Materials: Brass handle, stainless steel mic cap-  
sule, titanium diaphragm.  
-15  
-20  
An included foam windscreen reduces wind  
noise outdoors.  
Finish: Satin black handle and chrome mic cap-  
sule.  
Architects’ and Engineers’ Specifications  
120˚  
240˚  
OMNI 20 Hz-2 kHz  
5 kHz  
The microphone shall be a Crown CM-150  
or equivalent. It shall be an omnidirectional  
electret-condenser type powered by 18-48  
volt phantom power. Frequency response  
shall be uniform from 20 Hz to 20,000 Hz.  
Open-circuit sensitivity shall be 10.5 mV/Pa.  
Maximum SPL for 3% THD shall be 127 dB  
with 48-volt phantom power. Self-noise shall  
be 19 dB SPL A-weighted. Impedance shall  
be 240 ohms balanced. The mic shall be  
compatible with ½-inch (12.7 mm) indus-  
try standard calibration. The Crown CM-  
150 is specified.  
Dimensions: See Fig. 3.  
Weight: 4.48 ounces (127 grams).  
10 kHz  
20 kHz  
REAR  
180˚  
210˚  
150˚  
Included accessories: WS-15 foam wind-screen,  
carrying pouch, ASA-4 stand adapter and vinyl  
grille protector.  
Optional accessories: Crown PH-4B phantom  
power supply (4 channels, AC powered). Crown  
PH-1A phantom power supply (1 channel, bat-  
tery or AC powered).  
*1 pascal = 10 dynes/cm2 = 10 microbars = 94 dB  
SPL.  
 

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